Does the 290/X have FULL compatibility?
will all Future AMD GPU's have full compatibility?
Would you seek to to partner with one or more of those screen vendors to offer AMD GPU + screen bundles?
or money off screen coupons when purchasing 'X' AMD GPU?
1) Yes, the 290X supports all FreeSync features. Please see here for the list of all current products that support FreeSync, and what sub-features are supported.
2) I don't know what promotional deals are planned, yet. We're not at that stage of development.