yes, you'll be able to upgrade.
Though the positive reviews of A8N-SLI Deluxe seem to be a good indication of its quality, there are still a large number of issues being seen from posters here using this board (myself included).
If you're looking for a painless upgrade, this board may not be the best choice as it is still very new tech., and has plenty of kinks that need ironing out. On the other hand, the features it offers are hard to overlook.
I've RMA'd 2 of these boards already, yet still I see nothing that I would rather have (barring an A8N-Ultra version).