As previously reported, WWE is indeed building towards a Triple H vs. Kurt Angle match for SummerSlam.
As we may know, Triple H’s storylines are always kept top secret. The storyline was when Angle returned to WWE as the General Manager in April, he would eventually be wrestling again with the likely opponent being Triple H. The feud will start up after Stephanie McMahon would return and since she was the one initially running raw after she fired Mick Foley, this would create a problem between Angle and Stephanie McMahon.
As was initially noted, the plan for this match was to actually take place at next year’s WrestleMania but according to the Wrestling Observer Newsletter, several WWE officials feel it has to happen in SummerSlam because the company is looking to make SummerSlam as big as possible, that even includes bringing back other part-timers.
Source: Wrestling Observer Newsletter