I doubt RAW has been so successful that it has agents in SWAT, NWFP and now in Lahore city. Of course the RAW angle will be fully investigated by GoP as it should be. I doubt anything will come out of it, though.
On the other hand, one can immediately spot the similarities in the modus-operandi between Lahore and Mumbai attackers. My bet is that these guys belong to LeT/JuD/LeJ which are under pressure due to Lakhvi and Co. being put out of commission after Mumbai. Their goal is to attack vulnerable high-value targets like foreigners, to ensure GoP loses credibility at home and abroad. There may be other teams, fully trained and armed in Lashkar camps, lying low looking for high-value targets. They are locals, with local infrastructure and logistical support. I don't think we've seen the last of these guys, they seem to be getting bolder after every successful attack.