I've read that there may be an issue supporting all the 3000 series CPU's in the bios due to storage space inside the bios chips. For me this isn't an issue as the motherboard vendors can issue a new bios that only supports the 3K chips, or keep the older bioses that support the 1and2k chips. Give the user the option to update depending on which CPU they want to use, once you've updated the bios then you have to change the CPU to your new 3K series and it'll work no problem.
Hopefully they'll work it out that they can support all CPU's with the space they have one one bios, but there are ways around it if needed.
For example, the Asus ROG Crosshair VII Hero has 256 Mb Flash ROM, while a BIOS is only 8.44 Mb.