Plastic bolt shrouds are cracking on Tikkas. That's precisely why they replacing them with the metal ones on the new rifles. Bigger ejection port won't hurt for sure. Better quality plastic stock is needed as the old ones are rather slippery.
The bigger ejection port is a non-issue. My T3s are the best ejecting rifles I own, and it's trivial to pop in a single round. My M70, my Vanguard, my M77s, my X-bolts, my Kimber, my Sako, ejected brass hits the scope on all of them. Not on my T3s.
The plastic stock is what it is. If it's better for the same money, that's terrific. One virtue of the old one is its super stiff. That's rare in a Tupperware stock.
I think they switched to a pot metal/MIM bolt shroud because people bellyache about the plastic bolt shroud *way* more than is warranted. None of mine have cracked, and if they did, hey, gun still works, and stoeger will send me a new one.
They should have done a pot metal trigger guard too. The one on the Howa/Weatherbys doesn't get complained about, and it's literally dinky, as in "dinky car".
T3s are a good value because they are pretty much a sure thing. Order one, get one, it's exactly like all the others, works great, accurate, light and durable. No problems. It turns out that's worth something.