It is because, in this month there are 5 wednesdays, so the maintenance could be done any other week usually, twice a month.Yes I noticed this too. But, draw will happen for sure. CIC is good with current plan of 3,350 invites every 2 weeks.
By the way, No maintenance notice so far means we can witness 3,900 invites too. You never know what all surprises are there for tomorrow. But Yes, draw will happen as usual 99.99%
By the way, Talking about the ITA numbers, I don't really think there will be an increase at this part of the year. However, still we're up to be surprised by the CIC.