The new Burzum has been getting quite a bit of coverage on Deathmetal.org. For what it's worth, I think it's probably the best thing Vikernes has put out in a while (and I liked Fallen quite a bit). It's like a less demonstrative followup to HliūskjŠlf, which is interesting because to date the newer Burzum stuff has been quite a bit more demonstrative than the older releases. It's pretty laid-back contemplative, which makes sense given its genesis in soundtrack music, but it's definitely more compositionally involved than mere sonic wallpaper.
The new Summoning is excellent, like all of their releases, but that's already been discussed heavily here. I'm sort of excited about the new Graveland. Will Stronger Than Death was great, Spears of Heaven was mediocre like a lot of his post-Following the Voice of Blood stuff, but the Cold Winter Blades EP showed him branching out into newer sounds in an interesting way. I hope he keeps the momentum going for the new full-length. Maybe the longer gap between releases (outside of the remastered versions of Creed of Iron and Memory and Destiny) will have given Darken more time to write epic tunes.