Word on the Israeli street says:
If one sees the Badatz mehadrin logo and directly next to it (under) one sees the "kosher for Pesach" it is an indication the product is mehadrin non-kitnios kosher.
Alternatively, if one sees the Badatz Mehadrin logo, and ink jet typeset elsewhere on the package, not adjacent to the logo, there is the added wording of "kitnios".
In one case, two products, both a variety of the "Milky" pudding, one with kitnios and one without, both displaying the Badatz Mehadrin logo. Possibly, many/most shoppers will not make the differentiation.
On a connected note, all "Tnuva mehadrin" hashgacha products are kitnios free. An item that is mehadrin year round that is not mehadrin for Pesach will say "regular kosher" to highlight the difference.