Chris saves Sonic from the pool, and they become fast friends. Amy and Tails, maybe even Knuckles, Cream, and Cheese, come to live with him soon after. They hear of an E-Series robot rampaging downtown Station Square and ready the Tornado (unknown model) to defeat it, although Sonic's already on his way. As the Tornado leaves with Tails as pilot (Amy and Chris are in the second and third seats respectively), Danny joins in the backseat. This is the only actual model of the Tornado with four seats. Knuckles has already destroyed a robot that was about to harm Cream and Cheese. Another two copies appear and Sonic spin-dashes right through them, heading back to the Tornado. Eggman, Rouge and Shadow reveal their newest weapon, the Tornado having surpassed Beakon. Sonic grabs a Power Ring and is transformed into Super Sonic. Nothing else is really exploited or known. 
Original storylines seem to have been created for fights between Sonic and Eggman's team as Shadow was shown to be in the plotline but with no known connection as to how he survived his supposed death in Sonic Adventure 2. Chris and Danny also helped Amy and Tails aid Sonic in the orange X Tornado prototype, although the bios at the end of the video show Chris would have an obviously larger role than Danny. However, Danny's role was shortened much more by the addition of new characters and a plotline revision before Sonic X's release, demeaned even more so by 4Kids. While fighting with Shadow, Sonic uses a Power Ring to become Super Sonic. It was possibly obtainable in X when gathering the Chaos Emeralds since there were no Super Emeralds and Super Sonic was unleashed from Power Rings. It was probably scrapped since it might not have a major role, it could not be done this way in current games, or for another reason.
The silver mech serving Eggman his cards was the prototype for Decoe (as he does in the show), and some of the robots on the cards and slot machine never made it into the show's final production. The robot seen rampaging the city (not yet known whether or not to be Station Square) was also scrapped for the show, but released in a promotional toy line for the 4Kids version as parts that came along with each character.
The English version is now available on the TMS website. It is slightly modified from the original and features 4Kids ex-voice Andrew Rannels, the voice of X characters like Bokkun, who was not previously featured to show for Sonic X. It features a scene from the other promotional video for Sonic X (where Sonic speeds by a humanoid sentry bot) and was the first sign that 4Kids took over the English production of Sonic X. Notably, Danny's picture card was excluded from this version.
This is another Japanese video that promoted Sonic X prior to release, made in 2001, as it featured Mobians/anthropomorphs (human-like animals like Sonic) portrayed upright and at adult human height, including an animal similar to one that was picking on Tails in a flashback during X's 'The Dam Scam' episode (the orange ones, the promo has him wearing a purple sweater, black pants, and a beret). This means that Sonic X could have originally been meant to be set in Mobius of the Sonic the Hedgehog Archie series, or at least somewhere similar. This video also features scenes famous in the 4Kids and first Sonic Drive intro:
Sonic with 2 Emerald shards
The building he breaks out of to beat Eggman
The robot sentry (see above)
Sonic running past standing Knuckles, Amy, Cream, Cheese, and Tails to get to said tower
The first to use Sonic's crossed-arms pose with English letters (notably, this is not the X redraw, but official art from Sonic Adventure itself.)
Notably, while this promo came before the second official one (which was the first on this page), it was completely in English.
According to the English TMS trailer, Sonic X had been in production since 1993. Since both Sonic X and Sonic the Hedgehog: The Movie were made by Sonic Team, it could mean the original Sonic anime was originally to be a series, and Sonic X itself was never intended. Therefore, characters such as Metal Sonic could have existed within Sonic X.
In the second promo, Cheese is simply referred to as "Chao".