Some RAAus aircraft have been allowed in CTA for years: factory built aircraft only, flown by a PPL+RAA ticket holder. (Cambridge TAS operates under a special arrangement for solo RAAus students.)
How's about all you armchair experts just read the RAAus OPS manual, and add to that the frequent recent reports in the RAAus magazine for the TRUE story about what's around the corner.
I'm not an RAAus flyer, but I easily keep my finger on the pulse. All the info is freely available (unless you have to buy the magazine)