They’re not going to release a new transfer of the SE on blu unless it’s either a UHD release or it includes a restored OOT.
No one will care if it’s simply a new transfer of the SE on regular blu.
Lucasfilm held back the deleted scenes from the '04 dvd so they would have something to incentivize a rebuy on the next format. I can’t think of anything that big that they can use to sell us the movies yet again, aside from the obvious.
What exactly were the bonus features on the digital release a couple years ago?