Yes you're right... there are several options in the works currently.. and the dvd's will be released, Scifi said they may play them and also will be available on Itunes for download.

Also look out for a 3rd Stargate, which should premiere in 2008.

Well, how much can they really change, since Atlantis continues in the same universe, albeit a different galaxy. The stars from SG1 are expected to make some appearances in Atlantis, so their roles probably can't change much.

It really is too bad the Sci-Fi channel decided to cancel the show, but it does have to end sometime. Hopefully it will be an ending worthy of such a fun show.

There is also the possibility of another Star Gate spin-off. Perhaps the movies will wrap up the current SG1 series and lay the foundation for a new series. So the crew will like not died, retire, or otherwise fade off into the sunset. Nor is the villain, the Ori or Go ‘auld, likely to disappear entirely. And if the movies themselves do well enough, their may be more movies with the original/current cast. You always have to leave room for the possibility of a sequel or two or three.

Since time travel, alternate futures, and alternate realities episodes of the series seem to be the favorites of many fans, perhaps the movies will take place in the not too distant future, or will involve getting help from an alternate reality/universe group of Ancients that are willing to help save our reality/universe from the Ori for the good of all alternate realities/universes. Or perhaps we will find that we have been watching an alternate universe SG1 all along (like the Dream season of Dallas).
The movies may also involve the cast of Atlantis. Perhaps Daniel will finally get to go to Atlantis and continue his research of the Ancients. And perhaps Carter and MacKay will become involved in a long long long distance love/hate relationship that has Amanda Tapping making cameos on Atlantis. Or may Sam and Jack will finally hook-up. Teal'c will hook up with the Vulcan chick from Enterprise and together they will help rule the Jaffa and form a lasting alliance with the Tokra. And the Asgaard will finally defeat the Replicators and build another spaceship named after O'Neil. And of course Mitchell and Valla will hookup but get lost in another part of the universe where the live on a living spaceship and interact with alien Muppets.

Alas, all good things come to an end. Whatever the producers end up doing, I am sure I will end up watching it over and over again, then will buy the DVDs, and end up watching reruns of SG1 and Atlantis on the Sci-Fi channel from now until well into the foreseeable future.

I'd like to see the Tok'ra find a way to clone Ageria back to life before the series ends.

They could have a Babylon 5-like ending where they flash forward 20 or so years into the future at a time when the Goa'uld, Ori and Wraith threats have been eliminated. (How that happened, of course, could be explained in detail in the coming SG-1 movies.)

<Amanda Tapping (Sam Carter) is now confirmed to be joining Atlantis for at least 14 episodes next season>
How many episodes are there in a season?

Daniel Jackson always wanted to go to Atlantis to study the lost city of the Ancients.

I find the supposed sexual tension between MacKay and Carter boring.