There comes a point in any big negotiated deal - usually just before final closing - where one party sees the need to get an alternative bid on the table. This is primarily so that they can assure their stakeholders that the proposed transaction is the best available, that no obvious trick is being missed. It's called "shopping the deal" and it happens all the time. Huhne, from a business background, will know all about this tactic.
It can be pretty frustrating for the other party - but even more so for the alternative bidder who, 9 times out of 10, is being lined up for a Fail. They always get their hopes up, it rarely does them any good.
I strongly surmise this is what is happening right now. The commentariat, less familiar with these things perhaps, is hyperventilating - even Mr Dale opines that 'you can't ride two horses at once'. Well, yes, you can. But not for long; and the favourite wins more often than not. The Libs always like a two-horse race !
In the words of the song: if you can't ride two horses, get out of the circus.