Anybody have any idea where they are planned to be played?

No, especially the RFL! Possibly two from Halton, Langtree Park, Galpharm and Headingley. Unless, of course, one of them is London - Catalans when the idiots that run our game will probably take it to the Tulloch Caledonian Stadium in Inverness as part of a non-existent expansion plan

What about the JJB DW or whatever it's called these days. Although like the Galpharm it's a 25k stadium with a likey 15k crowd so Halton, Langtree etc would probably work better

Why would we play at a football stadium?

We're playing the final at a football stadium so why not?

IIRC when Wembley was rebuilt it was designated the National Stadium for Football and Rugby League

Do the RFL have anything to gain (financially) by staging the semi finals at Osdal, hence could their selection represent a conflict of interest if this venue is either chosen or excluded because of this?

I reckon if giants and rhinos are drawn together they will pick odsal.

probably stobart stadium, leigh sports village, city of salford stadium and odsal im guessing.

Possible fixtures:

Wigan/Saints vs Huddersfield/London (probably @ HJ Stadium)
Leigh/Leeds vs Warrington (probably @ Langtree Park)
or Leigh vs Catalans (probably @ Salford)
or Leeds vs Catalans (probably @ Keepmoat)

Wigan vs Leigh/Leeds (probably @ Langtree Park)
or Saints vs Leeds (probably @ Galpharm)
or Saints vs Leigh (probably @ HJ Stadium)
Huddersfield/London vs Warrington (probably @ Stobart)
or London vs Catalans (not sure, I'd say @ Barcelona)
or Huddersfield vs Catalans (again, not sure, I'd say @ The Shay)

Wigan vs Catalans/Warrington (probably @ Langtree Park)
or Saints vs Catalans (probably @ HJ Stadium)
or Saints vs Warrington (probably @ Stobart)
Huddersfield/London vs Leeds (probably @ Keepmoat)
or Huddersfield/London vs Leigh (probably @ Salford)

Let's play all semi final games at one stadium. Double header! Probley be better atmosphere between fans and attract better attendance. Dont know what venue tho.