Both Bob Odenkirk and Rhea Seehorn have said in interviews that they both see Kim continuing to visit Jimmy. Peter Gould said he would leave that up to the viewer.
From the "BCDC" in the farewell card below, they might be implying that Jimmy gets moved from ADX Montrose in Colorado to the lower-security Bernalillo County Detention Center in New Mexico (possibly for good behaviour?) which might make it easier for Kim to visit, if she does move back to New Mexico.
