The scanner is pretty self-explanatory. It screens by median returns in different time frames. It also screens for confirmed earnings vs unconfirmed and weekly and non weekly symbols.
Return Matrix is a symbol generated grid that shows median returns for long calls and puts, and straddles, for each day leading up to earnings date. And it's color coded as a "heat map" so you see at a glance if it's interesting. It's a different approach than CML Trade Machine which shows good, average and poor statistical results in terms of occurrences. So I think the two complement each other.
@Djtux allowed me a 7 day trial to see what it could do -- that's the best way to find out. There are other graphs also that we've seen for quite awhile that measure historical RV, IV, etc for straddles and calendars.