I didn't mean to say they should be released at EXACTLY the same time. Releases ahead of time are still perfectly fine.
What I'm saying is it's fairly clear some of the art has been in development for a while before the kickstarter, since they actually seem to have a decent release plan again, so they could have pumped the brakes a bit on TRO:CI
As for Succession Wars, there's been refreshed art in the Combat Manuals, and my understanding is there's actually a piece or two they commissioned Scroggins for that ended up having their products canceled, and thus not used, so it's less wait to pay for new art, and more spend the time to include art that's already paid for.
As mentioned, though CI IS getting a reprint (and hopefully that is an indicator the direction they want to take Battletech with a bit of reorganization for clarity is actually working), and, again, I hope it's viable to go back to layout to replace the artwork.