@Red:
TBQH, stability of V3,has been an issue with many for a while.
I do like V3, but when (not if) it crashes, it's a system killer and you soon just want to junk the bloody thing. If this release can fix stability issues, all the better.
As much as the Vapor team do like MOS, they'd be mad to not support 3.x, but it's their product and their choice. I would reckon that there will be releases for both versions of V.
-john