Interestingly enough,
per local environmental filling, the MBTA is planning on relatively substantial improvements to that Rochester facility. Using on-call contracts, so it'll take a while and be basically invisible as a project. Hell, that entire shop is invisible. I always thought it was leased on a short term (~2015?) basis to work through the HSP teething problems, but it looks like MassDOT straight up bought it in 2018.
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Overall, I appreciate that the MBTA has been developing an in-house(ish) heavy overhaul / carbody repair capability. Hopefully that means the MBTA now has the ability to sustain a progressive maintenance program instead of having to wait for a critical mass to support a large overhaul program, and/or having to send everything out on an adhoc basis. This is an interesting site choice, given it's distance from Boston and even SCR but I suppose being mostly heavy overhaul, that's not too much of a deal breaker. (Considering it's here or Delaware/PA)
However, the single most interesting line in that entire document is "The Site is anticipated to be a key component and resource for the South Coast Rail and Bourne Commuter Rail service expansions"
Bourne CR? If that's actually happing in the near future as anything other than a dinky, someone better call an audible on that SCR Middleborough secondary station location, but I'm going to say it's a vote in favor of SCR Full Build progressing.