I don't think there's much mistery - seems business as usual to me. First Mark & Guy, then the rest of the band, whoever may be needed. And then next spring or fall we'll have a new album. Nothing exciting in terms of procedures, but of course the prospect of a new MK album is always super exciting in itself.
Re: Playtime Deluxe, Guy must have been referring to Mark's ability to write songs (like "The Fish & the Bird", "Mademoiselle Will Decide" or "Haul Away", to name just three) that sound as if they'd always been around, like classics. He's incredibly good at that, and "Playtime" is just the latest example.
By the way, if he should plan to include "Playtime Deluxe" on the next record, I just hope he won't slow it down compared to the live version, like he did on several similar occasions before. Would be a pity, because it's such a wonderfully lively song.