Assuming you're not a Patreon subscriber (in which case you'll have already played it), chapter 52 is coming out very soon. Should be within a day or so, I believe, though don't quote me on that. Thanks to lhender below: 52's public release will be out 2 weeks post-Patreon release, so about a week from today.
Pretty sure they'll be returning to a monthly schedule after that. The December/January and July/August months are a bit of an exception; think they usually take breaks around then, and there's the occasional delay when attention is being focused elsewhere. Historically speaking, they've always done a good job of sticking to that one-chapter-per-month release schedule.