WWE Network’s Twitter account posted the following last night: 

More than 100 hours of #WCWMondayNitro on-demand NEXT WEEK on @WWENetwork!
Subscribe: http://WWENetwork.com!

This was also announced in a commercial on last night’s 8/25 WWE RAW. Nitro began as a 1-hour show from September 1995 to May 1996, then went to 2 hours on May 27, 1996 until the end of 1997. It would appear that Nitro episodes from 1995 to the beginning of 1997 will be added to the WWE Network next week.