There are not plans to build an airport hotel. There are some hotels close to the airport like Seat62K has said and others nearby such as the new Areca (Torrellano-Elche).
Respect the future train station at the airport, we will see it for Cercanias (trains). It's one of the projects rescued from economic crisis. It will be a new double railway between Alicante and Torrellano (with a stop at the airport), which will not pass through San Gabriel.
Regarding MON, sometimes you can see other models like the Airbus 300 and 330 on special dates. Respect the 757 are more easy to see it, but are not as common as 320 and 321.