The journal Polymer Chemistry, published by the RSC has announced that starting in 2015, they will be publishing weekly - or nearly so. They currently published 24 issues a year on the 7th and 21st of each month. They are now doubling that rate to 48 issues a year (presumably the other issues will come on the 14th and 28th of each month).
I have mixed feelings about this change. The journal is on my list of "must reads" and so I will soon have twice as much to keep up with. Plus, I referee articles for the journal, so I anticipate the number of requests to double as well.
The bigger concern is that the quality of the articles will remain as high as it currently is. They certainly are not turning away 24 issues worth of articles merely for space limitations. A more gradual rate of increase would at least create the perception that the quality will remain high. We'll just have to see what happens.