i own the s5ne.
1. It gets warm, i wouldn't say outright hot. depending on what is being done. Internet, Word process, etc....light stuff, won't get hot at all. i've watch a movie with it on my lap and it didn't seem to hot.
2. If your running on batteries, u will rarely hear the fan go on at all. When plugged in and doing intensive applications, the fan will kick in. Its not very audible unless u were in a really quiet place.
3. I have no issue with the keyboard, it is fairly quiet. really depends on the typer i would imagine as well. you've got ppl who tape and to those who actually type...or to those who type with one finger. i'm an avg. typer who knows his way around the keyboard and IMO it is quiet.