Sounds like a good deal. Reviews for both devices have been out for months, so what areas specifically are you looking forward for a comparison?
Macrumors also has plenty of rumours on the 12, wether or not the rumoured features are interesting enough to wait is really your preference.
I recommend you visit a shop or buy these devices outright from a good seller like Apple where you get two weeks to try them out fully, then decide what you’ll keep, but that may not be possible with that specific deal.