Does anyone have more info about developing games for RealArcade than Real is offering on their web site? Like costs, profit splits, what exactly is required to get ahold of the LithTech engine, etc?

They arent offering the source to the lithtech engine, just the SDK for it. It didnt take much to download it neither, just install realarcade then click the link on their page to download lithtech. It will download a small file which realarcade reads for the real (pun not intended url to the file, and begins downloading it.