they will continue to get bushier looking, and grow vertically during flower. the buds will displace leaf area giving it a bushier appearance. if you want my most honest opinion from dealing with over veg'd plants already, i would say go ahead and prune them. if you have the means to root some clones, and a way to make a few bucks off em legally i would say do that with your cuttings, otherwise just pitch them. i would just get some sharp scissors, and try to remove about 1/4 of the growth so there is more airflow. my biggest concern about what you have going on is how difficult it would be to take care of pest issues should they arise, or the possibility of humidity problems leading to bud rot... if you can get some oscillating fans going from up above, that would help...
also, just for clarification, when im talking about pruning, up talking about removing growth all around, so it frees up space from bottom to top, im not talking about taking a 1/4 off the top...
either way, its still looking real good!