It's quite obvious what TNA are planning to do.
Matt debuts and joins Immortal. Everything is cool and TNA jizz's at the fact that they have The Hardy Boyz, and then at around Slammiversary time, Matt turns on Jeff and becomes a face and they have a match for the TNA Championship TNA Immortal Championship.
If not at Slammiversary, because that's too far away, then it'll be at Destination X.