Beta 1B is internal.
The next public Beta is #2 on Thursday.
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Thank you for clarifing this BoogieBac
At the time that I made this post, there has been ONE update for Twilight of the Arnor. However, there appears to be a discrepancy between the version information displayed on the game start screen and the version information displayed on Stardock Central. Stardock Central (the place where you get the updates) will tell you if you have version A or B, but the game start screen apparently always says you have version A. I do not know exactly what these two areas displayed before and after the update; however, there is an easy way to tell if you have version B. Attempt to trade technologies with the computer; if you can successfully trade technologies, you have version B. The game will always crash if you try to trade technologies with version A (the original version of the Twilight of the Arnor Beta).
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I think most people were refering to TABeta #1 as just that and the initial update to that beta as TABeta #1a as it reflects in game.