Nothing to stop you taking other photos with other equipment and posting them in other places, in addition to your SIJ contributions.
I tend to agree with Richard: For me, in the coming month, the challenge will always come first, but I can't see myself consciously missing opportunities.
I actually have stowed away all my other carry-along cameras (mainly the LX100 that virtually lives in my messenger bag, as well as the GR) and put the E-PL7 with the 12mm in the LX100's space in the bag. I won't reach for anything (digital) that's in my camera cupboard at this moment for a month. So, I'm ready to go.
But depending on how particularily the weekends turn out, I simply may not be able to limit myself to the E-PL7, but will have to use the FF DSLR (mainly for documentary purposes, but also for general photography, depending on the circumstances). Specifically, I won't decline any invitations and obvious opportunities to take pictures just for the sake of the SiJ challenge. This means that the dedicated bags will stay packed and ready as usual, and some of the gear in them will most probably see some use.
However, the E-PL7 will *always* be with me, and *no* other camera will be when I'm *not* out to do photography, and additionally I will go on photo walks with the E-PL7 exclusively as often as possible (most days, I reckon - the camera can cope with low light, after all). All that is in itself pretty uncommon for me these days - and quite a challenge all by itself, to be honest (I've actually got completely used to packing a couple of cameras and/or lenses - it's a bit embarassing, really ...).
What I *will* avoid explicitly is the camera I used in 2015 - the E-M10. In fact, I'm going to take it out for a spell of night shooting today (equipped with a Nikon 50mm f/1.4 on a focal reducer in order get 35mm at f/1.0) and then switch cameras at midnight sharp and do my first shot with the E-PL7 in the first couple of minutes of 2016 - as a kind of initiation
Anyway, the E-M10 will hibernate throughout January, as will all the rest of the
gear.
M.