@Tripitaka
Shark PPC is not released yet due to AmigaOS 4 being only in prerelease state. It is therefore widely considered to be vaporware. Another accelerator known as ACK (which is also not released yet) is stated to come out with the prerelease of AmigaOS 4 when (and if) it comes out.
To make a long story short: If you want to plug a PowerPC accelerator into your A1200 you're either going to have to buy a used Blizzard PPC or wait a while for one of the above listed accelerator cards to be released.