CBS’ UPN net and Time Warner’s WB have announced plans to merge today, paving the way for a new net called The CW Network. The new net will launch in the fall and is a joint partnership between Warner Bros. (a Time-Warner unit) and CBS. CW is aiming for 30 hours of weekly programming aimed at the 18-34 set. The new CW net will be carried on Tribune’s station network, allowing for CW coverage in 48% of the U.S. The CW’s senior staff will be comprised of execs from both WB and UPN.