I just want them to be upfront and guarantee that next year we will not have a completely new OS named BleePo based on Gentoo and Enlightenment...

That I will be able to apt-get dist-upgrade the new OS when it comes out (or whatever rpm equivalent there is, if they sooo much insist it to be rpm based, which I haven't seen ONE good argument for a switch, anyway) and the only differences will be that it'll probably run a bit slower than on the new hardware and the hardware features that i don't have won't work... like digital compass for example.