A bit more (second-hand) info:
Abington - no upgrade/expansion activity as of Monday this week. My app is showing 2 of the 6 stalls are out of order. It was closed for a few weeks in November/December with a message on the Nav raising hopes that some sort of upgrade is planned, but no tangible progress so far. Expect to queue!
Gretna - there are now 14 V3 stalls in place, the 4 old V2 stalls have been removed which is why the site is offline. Hopefully not long to go before the upgraded site goes live but no real clue. Likely days, possibly weeks, probably not months...