I already sent a pm to CrookedFoot yesterday. He said that the arcade was on his list of things to do, but he doesn't know when they would actaully be done.
Upgrading to vB3.0.0 will do nothing to your skins makin gthem obsolete wise, but going to the RC3, RC4, they no longer use .style formats but .xml. The hack was tested wtih vB3.0.0, and would do no harm to your skins. But once again, it is very wise to test the hack for debuging options, such as running the same .style's with vb3 (not rc3) and other things. Using the same .style skins, it will take little to no work upgrading...hack wise, as the hacks edit the template files, as well as the hard scripts (php).
I can help with the vB testing as my host just went up today.