Apparently, it seems like Lenovo already has planned out its Marshmallow update road map according to a new leaked image today.
The K3 Note (International variant) will be the first device to receive the update in March, followed by the Chinese Vibe X3 and Vibe P1 during the same month. The rest of the handsets which include the International version of the A7000, Vibe P1, Vibe S1, Vibe X3 and A7000 Plus will all receive the update in the next 4 months.
Although this isn’t any official information, but the image seems legit enough.