According to GoodEReaders (and it looks legitimate), PocketBook will soon replace their bottom-of-the-line Basic 3 with a Basic 4. The Basic 4 will have the newer style (smaller) case and weigh only 145 grams (no light or touch screen). It looks almost exactly like their Lux Basic 2. (This means the whole 6" line will use the same basic casing.) Unlike the Basic 3, the Basic 4 will use an "HD Screen" (212 ppi) instead of the 167 ppi screen. That means all the "lower-end" PocketBooks will use a 212 ppi screen now. Tolino's and Kobo's low-end readers are also using 212 ppi screens. The only 167 ppi "hold-out" seems to be Amazon's Kindle Basic.
https://goodereader.com/blog/product/pocketbook-basic-4