Umm I don't have an exact answer for you. But here's my experience, when I was accepted to FSU (last month) I got a similar e-mail, and I checked, my aid was dropped by $1000.00 -.-' I have no idea why, I figured maybe they gave me too much, and someone else needs the fund. So I didn't question it at all... I'm sure the school had a reason.
Earlier this week I got the same e-mail again, so I went and check, nothing changed.
The only thing that followed was that they changed my due date for my remanding tuition fees.. my loans didn't come in yet, though my grant did (which they took all :'( it wasn't much to begin with lol).
So maybe your aid won't change, I'd suggest you take a look at it daily though incase it changes without you knowing. : )
You can always call the financial aid office and ask if you're concerned. ^_~