Tesla started delivering the Model 3, its first mass market electric auto, to customers in July.
Elon Musk tweeted the revised date on Wednesday, noting also that it would include a "test ride", meaning it'll be operational when it's first revealed to the public.
Diarmuid O'Connell, one of Tesla's longest-serving executives, has stepped down from his position as VP of business development.
Musk had earlier said the semi would be unveiled in September. It really was still on, but the reveal has been pushed back a month to October.
Housing market: London and south east are weakest regions - RICS
However, the survey also reports anecdotal evidence suggesting different levels of sctivity based on price and favouring properties below £250,000.
Tesla's plans for new electric vehicles including a commercial truck called the Tesla Semi were announced a year ago and in April Musk said the release of the semi-truck was set for September.
The menacing styling of the front end of the Tesla Semi.
He first teased the prospect of the semi-truck - as well as a smaller minibus - in his "master plan" that was released in July 2016.
Musk had written about the electric truck that its introduction would simultaneously reduce the cost of transporting cargo while increasing vehicular safety and ease of operation. It is rumored to have a working range of 200 to 300 miles, Reuters reported last month, which could be a sign that Tesla was specifically targeting the regional trucking market.