Not a trip report per se, but just wanted to give updates on the current conditions for the Mountaineer's Route based on a climb of the East Face and descent of the Mountaineer's Route this past weekend. (My camera died last week, so no photos, sorry).
The approach to Iceberg Lake is completely snow free.
The main MR gully has a large snow patch on the lower ~500' or so. It's possible to avoid this snow patch by climbing class 2/3 blocks on the side of the gully. I saw several people glissading down the snow patch in the afternoon, however, when I hit the patch on my way down from the summit at ~8:00 PM, I was happy to have ice axe and crampons. Above this large patch, the gully is essentially snow free to the notch.
I took the traverse from the notch to low on the summit plateau, which still had some snow on it, but there was an excellent boot pack. At ~6:30 PM in the evening, the snow was soft and easy to traverse in boots, although, I used (and was quite happy to have) an ice axe. Early in the morning, crampons may be required.
I did not do the 400' scramble from the notch directly to the summit, but reports from friends indicate it's snow free.
Hope this is helpful.