Keep in mind that Harbaugh is big on work ethic and locker room chemistry. He will not bring in anyone that he feels would be a cancer in the locker room. I suspect that Hastings will be promoted from the practice squad and put into the slot freed by cutting Edwards. It might be Matthews, but probably Hastings. I do not expect them to go outside for a receiver at this time.
While Reuland is a good pass receiving tight end, he is weak when it comes to blocking and special teams. One of Delanie Walkers strongest contributions is what he brings to special teams. If Walker is placed on injured reserve I would expect the 49ers to go outside for someone for the special team roll and only elevate Reuland if they cannot find someone.