I'm no longer a hands-on techie but;
1) No concrete Road Map ~ not concerned if considered as a siloed product.
I reckon MS gauges insufficient growth push from their customer base nor competitive threat for any significant development need. Many sites do not use all available functionality currently.
Also MS traditionally focuses on the client side functionality as part of their desktop territory grab. So they are milking the R&D investments with incremental upgrades and better management tools which have easier business cases for expenditure.
2) Incremental upgrades sufficient? As a siloed product, yes.
However, I wish MS would band their CRM efforts together with their Search engine, Messenger and Email in a more coherent fashion for a mass-market price offering, in a similar way to their previously siloed Office apps.
Doubt my contribution is worth putting a name to, but hope it gets the ball rolling for you.