If you're thinking of the 2017 complete series blu-ray release, the info I've seen indicates that it's just a repackaging of the previous single season blu-ray releases, with the exact same features.
If you mean the blu-rays compared to the DVDs, then I believe the blu-rays do have additional features and stuff that were not on the DVDs.
Kor
Yes, there's some great special features. Some new episode commentaries, some remarkably candid interviews, and a couple of round-table reunions. One of the cast (including Jeffrey Combs), and one with the writers.
Both of those are great. Pretty much all the other actors fawn over Scott Bakula, and express how gracious and generous he was as a lead, to the point that Scott was clearly getting a little uncomfortable with all the praise. (Basically the exact opposite of Shatner and TOS' cast).
There's also a funny moment when Dominic Keating complained about having to endure the Suliban makeup for the episode "Detained" and Jeffrey Combs said "Oh, poor baby!"
I learned some interesting things in the commentaries too, like the scenes of losing the baby in "Terra Prime" were REALLY emotional for Connor Trinneer, because he'd just found out his wife was pregnant with their first child.
And definitely check out the one that John Billingsley and his wife Bonita Friedericy recorded for "Regeneration". It's a hoot!
https://memory-alpha.fandom.com/wiki/Audio_commentary
I haven't started the show yet, but I have a question that I don't believe was explored in the show. What was Starfleet before Enterprise? Warp drive has been a thing for 88 years. Enterprise is the first ship to go Warp 5. "First Flight" established that Archer and Trip were part of the project that broke the Warp 2 barrier.
So let me get this straight. Starfleet is established with basic warp drive and what, about a dozen ships? Archer and Trip come along, and now ships can go Warp 2. The Enterprise is completed and can go warp 5. This means Henry Archer had conceived of the Warp 5 engine before Warp 2 was a thing. Was Starfleet even a thing when young Henry Archer came up with the idea of a Warp 5 engine?
Can someone make pre-Enterprise Starfleet make sense?
I do like that the NX-01 was the first Starfleet ship in the vein of the Federation Starfleet of previous shows.
The NX-Alpha and Beta in "First Flight" were explicitly based on Henry's design. The Warp 5 engine was always the ultimate goal but it probably took years or even decades of testing and working out the kinks at lower speeds before you get an engine like the one they had on the NX-01 (especially with little or no help from the Vulcans). Think of it like the Gemini and early Apollo missions. You have to get a lot of things right before you can land on the moon: long-duration spaceflight, rendezvous and docking with another spacecraft, testing the spacesuits, testing the command module, testing the lunar module, testing the command and lunar modules in lunar orbit, etc.
