The final release will have a number of fixes beyond the original public beta (V090).
Some of these are rather important if using P3D (ie preventing memory leaks).
There were also a few missing textures and one extra texture definition in the models.
Also for MP the flooding issue looks to have been solved (which it wasn't completely in V090).
There are also changes to some bugs in the armaments panel (mainly to do with the bomb dropping) and the rocket speed was not being updated correctly so rockets didn't fly as far as possible.
So, to sum up, when the final release of the T-28A is available (some time this week I hope) make sure you download that as there were quite a few bug fixes from the public beta.