This development was actually predicted. Ed Guinan and Richard Wasatonic of Villanova University recently suggested that Betelgeuse might "bounce back" within a week of Feb. 21st. Their prediction was based on a Fourier analysis of Betelgeuse's light curve, which revealed a strong 430-day period. If the current dimming was just an unusually deep dip in Betelgeuse's natural 430-day variability, they reasoned, its brightness should start to increase again on Feb 21st +/- 7 days.
Their prediction seems to be coming true. However, it is too early to draw a firm conclusion because the turnaround--if that is indeed what is happening---is still in its early stages.