11 zones currently exist on the main map so accounting for that we have gotten to see 2 of those zones...so that means were still missing around 9 on the existing map.
Second point someone saying class content doesn't matter to some people that is one of the largest reasons that people got the game. Was the promised class content on launch to include all classes and subclasses in the 5e phb as well as all races. Weather that matters to you to several people or not means very little as it matters to some of the people who purchased the game on the content promised when the initial plans for live release were given. As well as it may not matter to several people because maybe they already got the class they wanted in the game but there are people still want those classes or subclasses not yet included in the game. There are people who will not buy the game until they are included even because the class / race they enjoy currently is not available. Its a very valid arguement to have them all included as well as multiclassing as was originally planned and mercenary options again originally planned as it matters. 11 zones existing is more than enough content for initial launch considering players have access to 2 of those zones and not even the full zone for the underdark. 11 zones is a lot of content to play through if your intending to play through all the content and while I personally do not expect to see that all initally in early access. I would like to see us get access to levels 5/6 and all the classes / races in early access. As they said they wanted the content tested and it should be. I am hoping we see news coming out soon as to Patch 5.0 Plans and another class as were getting in that range druid was the first real addition to the game and I would hope were not 4-5 months from druid before we see the next class added as at that rate it will be like 2024 before the game is full released with there original promise in design.
An ideal patch 5.0 would be 1 class 1 race and level 5/6 to existing classes. Even if they don't add any additional zones and we would see it before the end of april and we should be seeing news soon I would hope. Even if we have a few bugs its not that big of a deal. Right now with an initial planned release for October/September 2021 when game launced we should be seeing classes added every 2 months if they plan to make that dead line.
As an Example - I would not assume it accurate but like
April - Barbarian
June - Paladin
August - Bard
Sept - Sorcerer/Monk
As a delay to the full release could be understandable we should be seeing classes come out at those rates along with additional content / races / levels / abilities for testing. If Single moders can make mods to include those classes and races or close proximities on nexux mods and have all the additional classes and be adding additional subclasses not included in the phb already while not as ideal as what i would expect from Larian I would expect them to be able to release a class every 2 months with 400 actual people able to work on the project. Otherwise I would be reaching out to some of those moders and hiring additional people to make up for poor performance on existing staff.
Don't get me wrong I would expect better results from existing staff however they should already be at the point to match existing mods for classes and just improving those so it shouldn't exactly be hard to make those classes functional in a 2 month per class window.
I would expect them to be adding classes and races each patch at this point as well as additional items I was actually a little disappointed we only saw the druid last patch though glad to see new content. Logically you would be thinking they would have been working on tools to make implimenting classes to the game a lot easier during that time frame. Sadly a lot of the better moders for the game have disappeared at this point not updating existing mods because of poor communication prior to the release of the druid as of late they seem to have been a lot more active on the forums which is a big positive now its a question of will they keep that up or is it going to repeat. Also there are people that do not want to look at installing mods till the full version of the game is released. To avoid re-installing as much as possible as an example or having to remove mods for any reason during early access for patches ect.
So seeing additional classes and races come into early access is important at this point.
Additionally concerning an act 4 / additional game play through content ... as with the fact 20th level isnt expected at full release I would expect we would see those additional levels and that additional content with dlc patches as I expect we will get the artificer probably with DLC content. Since larion would probably with to continue making additional money as would wotc after the games full release and you want to keep the machine going. Getting additional classes / races and content is a good way to push that as well as will keep people busy after release while its being developed.