Another report coming from KGI analyst Ming-Chi Kuo affirmed, that Apple will release three new iPad models in quarter 2 of this year. The iPad mini 4 will not get an update, but a new 10 inch version with slim bezels will be released instead.
http://www.notebookcheck.net/Ming-Chi-Kuo-Three-new-iPads-to-come-in-2nd-quarter-no-iPad-mini.190732.0.html