If you are still considering a way in which to offer the content of DKS to owners of D2:ED, may I suggest you follow the same route as other developers/publishers have done recently? Mainly, offer DKS to existing owners of D2:ED for a percentage off. I would suggest, the same price as the expansion. That way, owners of D2:ED can determine for themselves whether they want to continue with just the engine enhancements provided by the expansion, or whether they wish to start over with DKS. All without having to consider the additional cost incurred with DKS -- as this could be negated with the provision of a 50% off offer.
For reference, both GamersGate and Steam have systems in place that allow just this sort of offer. And both sites are currently using these systems for "loyalty" offers in regards to Stalker Call of Pripyat, Cities XL 2011 and Blood Bowl Legendary Edition.
Taking advantage of such systems also negates the need to spend additional development time on creating additional patches for providing as much of the DKS updates to D2:ED as possible given the problems with the save games. So ultimately, it's win-win situation for everyone.
I look forward to the possible provision of such an offer as I would love to get the DKS content, but having paid $49.99 for D2:ED, paying $39.95 for the DKS does seem a little excessive.
