Best place to keep an eye is bidb.uk, as well as Openreach
where and when (which says Openreach are building FTTP in Corby, but unfortunately no news about your particular postcode)
Note: there are unlikely to be any more FTTC upgrades anywhere. You'll almost certainly go straight to FTTP.
As for Virgin versus 11 meg ADSL: it's your call, but maybe you just have to hold your nose for the next couple of years... or else check out 4G/5G coverage.