. Chances are that the links were data-mined by people, and that AD is swapping things around to prepare on their website. Who knows.
This is exactly the case, and what you are seeing here is not necessarily the final build.
Heh, in a far away theoretical build number flame war, you are right... in theory it could be, that it's not the final build... but I tell you, it is :) and will be. always has been, and they done compile trials for 30 different software packages to then update them 1 week later.
My point is, there is 0 reason not to start trying to support 2015 from corona renders point of view, because they know exactly what they need to, and most likely have for quite a while. I assume they work with autodesk and therefor have access to earlier builds through out the year.
Anyway, I don't want to start a war about stupid build numbers etc. Get it, use it if you want, if not wait...
Looking forward to a corona 2015 build.