No one here knows what information or documents the request is for. It is true that this most commonly means a Finger Print request. Given the timing it is MOST LIKELY a Finger Print request.
But it could be a number of other requests, ranging from a request for a particular document or specific information, to RQ CIT 0171 or PPQ - QAE CIT 0205, which are requests for a number of documents and information related to showing actual presence in Canada.
Thus, while it quite likely is merely a Finger Print request, you cannot know what it actually is until you receive it. Which you should within a week or two. No need to worry. Not much good trying to guess what it is. You need the correspondence sent in order to properly obtain and submit the Finger Prints, at least to do so in a way which will best expedite processing.
Go with the flow.