I thought that too, but the way she said that she "Has no regrets" and that she knew what was coming made me think otherwise. Likewise, Noel's message sounds like he is trying to prepare Noel for Caius and Serah's deaths. Considering that those fragments only appear after you have defeated the final boss, rather than after the time Serah was in the Void Beyond also supports the idea in my mind
Spoiler
true. I guess that's yet another thing supporting the notion that there will be another sequel, unless the alleged true ending ties all those knots somehow; I'm not gonna youtube it and spoil it just to confirm its existence LOL