There have been mixed reactions to Obama's speech which addressed events currently unfolding in the Middle-East, including the US stance on Palestine:

From the BBC" "President Obama said the borders of Israel and a Palestinian state should be based on pre-1967 borders, referring to those that existed before the Six-Day War.
The approach was immediately rejected by Israeli Prime Minister Benjamin Netanyahu, who called the 1967 lines "indefensible"."
http://www.bbc.co.uk/news/world-us-canada-13450481

The Guardian argues that Netanyahu's reaction is a bit of a front, as the position laid out by the Obama administration in this speech, remains the same as that of his predecessors Clinton and Bush.
However that is something of an aside.

I'm wondering, if this speech is an indication that the US may not perhaps use their Veto this coming September (as one might otherwise expect) to prevent the UN recognising Palestine as an independent state?

As far as I am aware the US has already declared it's rejection of the Palestinian attempt for Palestine to be recognised as a country. Is it simply a matter of getting in ahead of this September? The language Obama used included a reference to "land swaps", thus allowing in theory for the Israeli retention of currently illegal settlements on the West Bank. I believe that the Palestinian Authority will not include any proposed "land swaps" in the resolution to be put before the UN in September.

My guess is that Obama will Veto the resolution (following the use of his Veto in February) on this basis. But I would be interested to hear other people's take on the situation.