Nuke 8 has been out for sometime here are some observations.
The camera tracker can now scale your scene based on real world measurements. No more objects that are -456.890 in scale. The stills solver works if you take your photos with the number 3 in mind. Nuke needs 3 points to calculate x,y,z axis, make sure the images you give it reflect that. The editGeo will prove to be a time saver. Model builder is getting better, far from perfect but like all good features making forward progress. Watch out for co-planar faces and vertices. Both the camera tracker and model builder has made progress in both how they work and how to make them work. That is very important.
Match grade is some what of a disappointment. The workflow for me and for most vendors the QuickTime you deliver to the client must match the dailies the editor and director have been staring at for months. Match grade failed pretty bad. I wouldn't go as far as writing it off but as for making dailies for editorial didn't get easier or faster. Whatever the mojo is I haven't found it.
Paint seems fine and the full frame rendering is amazing. Having your playback not break when you zoom in is a game changer. Your supers are going to love it.
The new color controls are cool but small. Option+command will bring up the old pop up window(it's hard to argue with 1993).
The new QuickTime settings in the writes and reads seem to help the age long color space problems with QuickTime movies. This is nice.
Nothing seems to be broken or acting differently. Only the new nodes and features seem to have bugs. Which brings me to the new submit your cash report dialog. We might get a better Nuke because of it. I almost never sent that info to the The Foundry. Shame on me.
I have been pushing Nuke 8 pretty far, 2d compositing, paint and 3d are in my mind very strong. A good release.