The only real difference in Rolling stock is the newer livery, which you may see on the 156s when travelling between Edinburgh and Glasgow.
As has been mentioned, I think it's now 4 Trains a day operated by a 67 and 6 Mk2fs in EWS Charter livery.
In Waverley, you're likely to see 156s, 158s, 170s, 322s, 67+Mk2fs, 220s and 221s, 225s and HSTs you might also see an FTPE 185, although they seem to use whichever platform has space, so can be pretty much anywhere in the station. At the East side of the station, there are the old Motorail platforms which are used as sidings, and there's normally a 67 and a 90 in them.
Of course, if you go at the right time (ie, late at night or early in the morning) you may see the Caledonian Sleeper in the station. If you go at night, it'll be in platform 11.