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There should be other keyblades. Look at the ones in the BBS Final Mix + Vid around Aqua before Terra falls, they are probablly other wielders keyblades from the war. So there should be other new keyblades, just not belonging to VAT.
No I think they won't get to used different Keyblades, especially not Ven the Way he Holds and uses his keyblade.
In every kingdom hearts game even COM you've been able to customize or upgrade your weapon.
Roxas is most likely only to wield kingdom key, oathkeeper, and oblivion in days. Ive been proven wrong oh well...And from previous posts in this thread it seems your able to in 358/2 days you can too. Why would this game be different?