I'm definitely impressed with Brit in this commercial. She's been getting back to her more confident self over the past year, and this is the first time when I've felt like any sort of "performance" of hers (in a commercial, awards show, public appearance, etc.) was like the old Britney. Nothing like the rushed and nervous girl from the VMAs last year.
There is absolutely no way Britney's not going to be at the VMAs. With this promo spot she is getting people's hopes up and she wouldn't let her fans down.