Catalyst Game Labs have released the BattleTech: Master Unit List Battle Values PDF.
From their website:
The Master Unit List: Battle Values is the first installment in the long-awaited Master Unit List BattleTech game aids. With this product you will have a complete list of all units that currently have a Battle Value, their tonnage, the era they were introduced and the factions who have access to them in the Jihad and Early Dark Age. The Master Unit List is the comprehensive game aid for building a BattleTech force and is the official BattleTech Tournament Battle Value reference guide.