Brexit He's proroging at the first opportunity, while demanding an election. Both tactics which are pushing for a process leading to a Queen's speech. Ideally for Johnson, before 31st October( which is why the government had a hissy fit when The opposition didn't support an election). This exposes his position regarding a deal. He wants to bring back May's deal with ( which the speaker won't allow during this session of parliament) the backstop confined to Northern Ireland. He will then bring it back to the commons during the week before the deadline and present the MPs with a cliff edge, a deadly serious deadline this time, and try to force it through. Unfortunately in order to get it through he will need a lot of Labour votes. Something which is tragically impossible, at least with the current parliament. Also there is an open goal for a vote of confidence, which Corbyn can call at anytime, after the prorogation period, unless he sneaks it in this evening before it.
However if he gets his general election before the deadline all he has to do is agree an election pact with the Brexit party and he's laughing, or so he thinks. Because it will result in a fatal split in the Conservative party.
The opposition smells a rat and won't agree to an election until after the deadline, which fatally weakens Johnson, as the Brexit party will then demolish the Conservative party. Thus ushering in a Corbyn government.