This thing will not see a major pop in price until it shows a positive revenue.
Once it shows a profit, the ROI will be higher than it should be, due to a reduced liabilities/debt(bailed in securities). That may allow the bank to trade at a multiple of book value as most financial institutions.
However this is several quarters if not years away. Q3 NBG Greece showed a profit, but the NBG Group showed a loss, so we are on the verge of improvement, if we see a inflow of deposits, we should get back to profits.