AMD's upcoming Carrizo APU might not make it to the desktop market at all.
According to Italian tech site bitsandchips.it, citing industry sources, AMD plans to limit Carrizo to mobile parts. Furthermore the source claims Carrizo will not support DDR4 memory. We cannot confirm or deny the report at this time.
If the rumours turn out to be true, AMD will not have a new desktop platform next year. Bear in mind that Intel is doing the exact same thing by bringing 14nm silicon to mobile rather than desktop. AMD's roadmap previously pointed to a desktop Carrizo launch in 2015.
AMD's FM2+ socket and Kaveri derivatives would have to hold the line until 2016. The same goes for the AM3+ platform, which should also last until 2016.
Not much is known about Carrizo at the moment, hence we are not in a position to say much about the latest rumours. AMD's first 20nm APU will be Nolan, but Carrizo will be the first 20nm big core. AMD confirmed a number of delays in a roadmap leaked last August.
The company recently confirmed its first 20nm products are coming next year. In all likelihood AMD will be selling 32nm, 28nm and 20nm parts next year.