If it is Romulans specifically, I hope they get rid of the idea that the two sides haven't seen each other prior to the TOS era. Lots of convoluted convenient avoidances is too restrictive when the 'loss' is a throwaway point in one episode (the racism towards Spock could have happened without this 'secret', so it was all for one reveal shot).
They could retcon Spock's reaction to "Oh my Surak, he looks like my dad!"