Its not formal-formal yet, and the middle of the bridge is missing, but it was presented in the MassDOT highway report yesterday: the highlights are buffered bike lanes for the bulk of the bridge, with some pinching at the Boston end to accommodate turn and bus lanes. the buffered lanes look somewhat narrower than the coned ones which currently occupy a full traffic lane, though not at the message boards, to accommodate those bus lane(s?), but overall I have no objections to what's shown. Apparently we should expect implementation to start next month!
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These look pretty good. I'm really not concerned with the lane being narrower on the bridge with a buffer - as long as there is enough room to pass other bikers. However I do think leaving the NB bike lane on the boston side unprotected was a missed opportunity. If they are going to restripe this street anyway, there needs to be either some separation or traffic calming there as NB cars often speed in excess of 40mph to get through the beacon st light onto the bridge. Hopefully this is just an early design and they plan to install flex posts or something. Safe biking infrastructure on the bridge is less useful if less experienced riders can't get to the bridge safely.