Her exciting news will be related to the live album. Probably a tv appearance or performance or something.
It'd be cool if they let her perform at the ACMs in April, but they don't really have 'throwback' or 'tribute' performances to living, active artists as far as I know. So there wouldn't be grounds for that.
Ellen and other talk shows are definitely open to letting Shania perform old material since it's promoting a new release. IDK if she could get away with it on The Voice and stuff tho.
I feel like we'll see her on Ellen, The Talk, and a late night show or two in the coming weeks.
She will probably be asked about a tour and new album.
Speaking of a tour. She has hinted that she'd like to do a small one this year, and she could definitely sell out a tour without releasing a new album. A 'Hits' tour, if you would. Could help spark interest in new material as well.