- 第二天：遥控手柄和地图 Upward 已公布。工程师成就也过后在更新页面被加入。
- 第三天：地图 Hightower 已公布。南部的款待也被提及但没有详细资料。枪炮工之臂和能扛运建筑的能力也通过隐藏页面登场。
- 第四天：枪炮工之臂和地图 Thunder Mountain 已公布。
社区制作地图 Coldfront 也被加入在补丁里，但没被 Valve 提及。
While officially announced on July 5, 2010, numerous references had been made by Valve prior to the release.
Repair Node (scrapped)
On March 2, 2010, Valve published a post on the TF2 Official Blog, Dammit dammit dammit dammit!, describing an idea for a new Engineer building, the Repair Node. The idea was rejected after playtesting.
The Repair Node reappeared in the video which accompanied the 119th update.
A blueprint of the Repair Node appears on the Engineer Update site, with the text "...R WORK" visibly written over it, and then a different view of the same blueprint, on the hidden Radigan page, saying "..LL NEVER W...". It seems likely the full text reads "WILL NEVER WORK" or "IT'LL NEVER WORK".
Instant teleport (scrapped)
In an interview, Robin Walker discussed a cut and unnamed Engineer building, referred to by the community as the Instant teleport, that would immediately teleport the Engineer back to his teleporter exit.
Screenshot from Robin Walker
On June 27, 2010, Valve sent an in-game screenshot to the Apocalypse Gaming Community as a thank-you present for hosting the Battle of Both Worlds event. The screenshot was accompanied by the following message by Robin Walker: "We didn't give you a photo of us signing. After some conversation here, we decided that a more fun way to prove that you did get the shirts from us is to give you something about the upcoming Engineer Update that could only have come from us. Please find this something attached."
This picture teased what could be a new map, later revealed to be Upward. It also shows the Engineer with his toolcase on his shoulder, teasing the building-moving mechanic.
On July 2, 2010, the Loose Canon comic was published, sparking speculation that the start of the Engineer Update had begun.
- On July 5, 2010, moments before the Update's official announcement, Shawn posted an announcement to the official Team Fortress 2 Steam group entitled "link" which consisted of random text linking to the official Engineer Update page.
- During the Engineer Update, the "Smelt Reclaimed Metal" and "Smelt Refined Metal" blueprints were disabled to prevent players from smelting and unsmelting metal rapidly in an attempt to find a Golden Wrench.
- They were not re-enabled until months after the fact with the release of the Mann-Conomy Update.
- The banner of the update page altered to indicate the update's progression.
- Along with a gauge representing the number of Golden Wrenches found, a lightbulb would be lit for every milestone. On release day, all lightbulbs were lit.
- In Day One of the Engineer Update, several yellowed photos referencing the Storyline of Team Fortress 2 can be seen, such as a huge Australium nugget, several newspapers, the 1850s mercenaries, Radigan Conagher testing the old TFC Wrench, the assembled TFC Mercenaries, an 1850s Sentry Gun and Payload Cart, a dartboard showing a Australian boxing a Kangaroo, several ideas to save Abraham Lincoln if he had not died, a Scout Robot from Mann vs Machine, The Map of Mann's Land, a crossed out picture of the Repair Node, several photos showing Top Hats and at the bottom, a picture showing the TFC Engineer and the young Engineer trying on his very first pair of goggles, as well as a newspaper from the WAR! Update.