A recent report reveals that WhatsApp is going to introduce Sticker reactions in its Android app. WhatsApp has allowed some users to test this feature in beta channel. Being the most important feature among all other upcoming features, the testing will probably be available for all users in next beta version.
Currently, there is no news about number of reaction a sticker will have. However, it is expected that each sticker may contain minimum 4 reactions which will be Lol, Love, Sad and Wow. From the Stickers View, you will be able to select a Sticker by tapping the new Love icon. Users will have to download Sticker reactions separately and additions of more reactions are expected to be added with time.