It's quite a normal practice to re-release an album after some tme with extra goodies on it: Roadrunner does with with every [their] succesful band: Killswitch Engage re-released 2 last albums, Slipknot did, CoF too. The thing is - they don't put too much on re-releases, may be demo tracks and couple videos. IF we get Fiction re-released with entire Hultsfred gig - it's gona be fantastic.
Or it can be that a few clips would be released and the rest gone for upcoming DVD.
I think it's a good practice, I can see a few good points