Hi Karen
Think I can help you with this one.
I am a manager for First Choice/ Thomson Holidays!!
All holiday companies have delayed launching their summer 2010 brochures until end June/ July. The reason for this, is the lovely old credit crunch!
They want to try and shift this years stock before launching next year (normally all companies launch their following years brochures in April- so around this kind of time)
In terms of the 7 day thing, you are right, most tour op's will say 7 days is needed before you can get married, but this is really to cover their backs, there is no actual legal requirement.
I know what you mean about guests wanting to book flights, I was going to send my invites out this month (wedding june 2010) but it seems silly to send them out if people cant book, so im going to hold off!!!VERY annoying!