I had expect Wilzoch to stay, too. I don't know what the full story is there, and I've not seen a Sage announcement either. I'll probably get some insight to this over the next week.
I think you have the development question wrong. Scottsdale has a very competent development team, but Sage has underfunded that for a couple years now. They know what to do in many areas, but they need some more bodies.
Swiftpage is strategically trapped in the low end of the marketing automation market. They are about to be squeezed out by full-package offerings like SalesFusion and Zift. They need SLX CRM more than SLX needs them.
The development pushes in the CRM market is in:
1) mobile. SLX has a very, very strong entrant there, which Sage is essentially licensing for its other mobile initiatives.
2) Social marketing. SLX and Sage CRM have initiatives into tapping into this, but the whole area is moving pretty fluidly.
3) marketing automation (this includes social). salesforce and Oracle have captive marketing automation functionality now. Hubspot and Infusionsoft have significant growth offering essentially turnkey marketing-CRM results. Contact and opportunity mgt are still important, but the marketing integration is where a lot of the new evaluations are including.
For anybody curious as to what this MA-CRM integration is about, take a close look at Hubspot.
In 3) we could see melding of of development expertise between SP and SLX. My ideal world would include a merger with SaleFusion, but that's not gonna happen. The characterization of the deal announcement was pretty clear that R&D $$ was part of the VC funding.
It will also be interesting to see if any of this new development is pulled into Sage CRM through Sage's ongoing ownership of the venture.