TL;DR An accelerator with the performance of a 68060 @ 150 mhz running in an Atari STf.
I'm not sure how familiar folks are with the "Apollo" CPU core and the "Vampire" line of accelerators for the Amiga. The Apollo CPU is a ground up brand new 68K compatible core running in FPGA, current performance in a relatively low price FPGA (large but not super fast) makes the CPU core at least as fast as a 68060 @ 150 mhz (fastest speed that shipped was 75 mhz). The Vampire accelerator uses the "Apollo 68080" core and via the FPGA also adds AGA chipset (and more features) to older Amigas such as the 500, 600, etc. The apollo core also has instruction compatibility across all 68K cpus so should be more compatible with the original 68000 than the 68040 or 68060..
Here's a post that shows the Apollo team has a Vampire accelerator running in a 1040STf:
Scroll down to about the bottom and you'll see the pic.
It looks a little funny because they stacked a bunch of 68000 CPU sockets in there to raise the board above the shielded part of the ST chipset (the video shifter was in the middle underneath the shielding?). This is pretty exciting as this would literally take a stock STf and give it more CPU performance than a 68060 accelerator would. (The Vampire accelerator also comes with 128MB of RAM onboard , "fast ram" for the FPGA CPU).
In the future they're going to do an even higher end version that raises the performance about 3x, but of course cost 3x. The current Vampire 600 accelerator goes for 250 Euros, and a faster binned version is 289 EU. They are ramping up production of the 600 version and the Vampire Amiga 500 version (shown attached to an Atari 1040STf in the pic).
P.S. To be clear i'm not associated with this group in any way, just super excited at their work .