On the one hand, the time period should be really interesting, being closer to the start period of "Medieval TW: Viking invasion" (one of my favourite installments) than the start of Rome 2.
Also, this time period promises some serious diversity in terms of units: unlike Rome 2, which generally has pretty same-y units (at least compared to Medieval 2). Add to this the fact that they are apparently bringing back a load of diplomatic options that didn't appear in Rome 2, and it should be a pretty interesting game.
On the other hand, that is all relative to Rome 2, which despite the obscene number of hours I appear to have put into it, has never really seized me in the way some of the previous TW games have.
Also, full price? Really? I would hope that as one final display of reconciliation they are going to offer a discount for people who bought/pre-ordered Rome 2. Seeing as how we were very much guinea pigs for a broken engine, that really seems fair*. As for giving money upfront: CA have practically no chance of getting me to pre-order anything from them ever again.
*Person who belongs to a group thinks that that group should have money off a product? Who saw that coming?