I dont have detailed information on the OLEDB story but I do know we're working to support them in 64bit to some degree (I dont know if thats 100% of what we did in 32bit or just some part of that full support).
In Server 10.2 we've made progress and you can use it as a datasource (Server 10.1 you cannot).
I'm still working on the 64bit Background story.
So: when we move to 64bit (all products), it will hopefully be a none issue (ie, we're working that out right now in the 64bit products we have)