Trinity's been out for a few months now, but it was OEM-only for a while. The parts are finally showing up on computer parts websites, though.
Newegg has the following FM2 processors:
A4-5300 3.4Ghz dual-core, with a Radeon 7480D iGPU, $65
A6-5400K, 3.6Ghz dual-core, with a Radeon 7540D iGPU, $75
A8-5600K, 3.6Ghz quad-core, with a Radeon 7560D iGPU, $110
A10-5800K, 3.8Ghz quad-core, with a Radeon 7660D iGPU, $130.
It seems like AMD isn't playing the "more cores" game now. They've cut down on power consumption; the A4 and A6 are 65W, the A8 and A10 are 100W, compared to the FX-8120's 125W TDP.
PassMark favors the A10 heavily; it shows the A10 as outperforming the i5-2500K. That's serious ammo for an Intel vs. AMD argument, but that's the only benchmark I can find that really supports the A10 to that degree. Most of the other things I've seen put the A10 at 60-80% of the 2500K's performance in similar tests.
The cost, though, means a lot. The 2500K is $220 on Newegg, while the A10 is much cheaper at $130, including a solid iGPU.
EDIT: The A10 is 3.8Ghz, not the 3.6 I originally posted.