Parmandur
Book-Friend, he/him
I'm not sure how to read that. In context, it seems he's talking about releasing sourcebooks for classic and new MTG worlds, rather than say Greyhawk or Dark Sun.
Personally, I'm not particularly interested in any MTG sourcebooks as the lore doesn't appeal (and I say that as a long time on-off Magic player), so hope we see SCAG equivalents for some of the classic D&D worlds. It's a shame the Wayfarer's Guide to Eberron didn't get the full dead-tree treatment as it would be a useful measure of demand for some of the existing non-FR settings.
Minor grumblings aside, this is very positive news for the hobby. I still can't believe the swell in popularity D&D has experienced under 5th Edition. Long may it continue!
The most natural way to read it is that it means old Magic settings AND old D&D settings, and new to both settings. At the very least, this means they are thinking and talking about these options extensively if it spills over from the Prez in a fluff piece.