Sure, and that's exactly what you want if you are on a rolling release, isn't it? If you neglect the rolling release for a month, what did you expect would happen? Also if you have more apps and packages, the more updates will come out. Rolling releases are for people who maintain the system and care about the updates.
Read the manual intervention notes from Arch that could be important. And do the update. That's normal and nothing to worrry about, if you know what you are doing.