As far as cosmetics for the outside, some areas will definately look new. Maybe no design change, but cleaned up, painted...etc.... From the TTA today, as it stands, the whole entrance area is a war zone. They could not open without doing any work to the entry, fastpass structure and entrance signage, so expect it to look new, even if its just 1975 new.
The TTA lighting looked great tonight. All the lighting along the Ave of Planets is red, after passing Mickey's StarTraders it was blue all the way to SM. After the split towards the CoP, they were bright white, along the edge of CoP, a muted yellowish/orange, then the dark Buzz tunnel and back to red. The red is especially noticable from the hub.
My take on all the ups and downs of the MK....well, I get down here with my family usually once a year for 10 to 14 days every February. I used to look for the negatives but that would just ruin what was supposed to be fun. Maybe its the aging process (I'm now 48), but for the last couple of visits, I've started to notice the positives instead of the negs. It makes for a much better visit. I can't imagine coming to WDW once a week or even once a month. There would be no magic left in it for me. My kids (19 and 16) think I should get a job here, but heck no...why would I want to ruin what makes those yearly visits so special. Yes, I read these forums and many others and shake my head when everyone complains about that burned out light bulb behind the sign, under the rug, 2 blocks from back side of wherever...you know what I mean. Believe me, I understand where you're coming from. I used to be like you and sometimes I still am, but I'm learning, and it's ended up making my trips to Disney that much better. Just try and step back and look at it from the perspective of that tourist that will come here just once in their life (because of $$) and notice the joy that they experience with each new discovery around every corner. Better yet, try to bring someone you know that hasn't been to WDW (I know that person could be tough to find) and enjoy it through them. (Don't show them the bad-I bet they won't notice it.)
Sorry I drifted so far off topic. And by the way, for as old and rough SM was, I loved it. I've been riding it since I was 14 in 1975 and I'd miss it if it deviated too far from its original form, so I'm probably gonna be happy this coming February.