In my game, at least, the kissing scene is also gone with Wyll. Asking for a kiss causes the conversation to end immediately.
Same with Shadowheart so I guess they're all broken now.
Okay, it seems to be a mod issue. I had thought at first that it couldn't be, because I had disabled my mods and then loaded an old, pre-mod save, but it turned out that I still had some overrides in there. Once I removed those, the kiss scene occurs again.
HOWEVER...
...while previously Wyll ended the kiss scene with an adorable sappy smile, he now looks unhappy afterwards! Like, he's smiling, and then his mouth turns downwards like he just remembered something really unpleasant, and he starts scowling.
EDIT: Okay, the precise sequence of events is as follows.
1) Camera on Wyll, normal post-kiss smile.
2) Camera on my character, looking down and then looking back up.
3) Camera on Wyll, his mouth turns down and his expression becomes displeased.
EDIT 2: It may be worth mentioning that, prior to this patch, the kiss always ended the conversation. Maybe this weird expression change is as a result of us being returned to the normal conversation menu now, after the kiss.