Short summary for people:
RX 580 vs 480:
Same cores, TMUs, ROPs, memory configuration/bus.
Base clock 1257 vs 1120 (+12.23%)
Boost clock 1340 vs 1266 (+5.85%)
No change in memory clock
RX 570 vs 470:
Same cores, TMUs, ROPs, memory configuration/bus.
Base clock 1168 vs 926 (+26.13%)
Boost clock 1244 vs 1206 (+3.15%)
Memory clock 7000 vs 6600 (+6.06%)
RX 560 vs 460:
1024 cores vs 896 (+14.29%)
64 vs 56 TMUs (+14.29%)
Same # of ROPs
Base clock 1175 vs 1090 (+7.80%)
Boost clock 1257 vs 1200 (+4.75%)
Memory only 4GB, no "up to 4GB"
And a new RX 550 which has unconfirmed specs.
Also, the slides claim "3rd Gen FinFET 14" whatever that means. As well as "enhanced idle & multi-monitor efficiency"
HEVC H.265 4K encode/decode being touted as well.