John Gruber is one of those journalists that cover the news of Apple with best reputation. Always count with first-hand information on the plans of the company and on this occasion has revealed information about possible future launch of iMessage for Android.
Not is the first time that Gruber speaks about this possibility, but now has mentioned that knows the existence of some models of the possible design of the app for Android.

In a future iMessage could reach Android… or not…
According to account there are several models of how the app could be. Some are limited to replicate the design of iOS app, while others go a step further and are based on Material Design, design standards which uses Google when creating their apps for Android and have also led to iOS.
At this time iMessage is an instant messaging service that works on iPhone, iPad, iPod Touch, Mac and Apple Watch. No other device can access this communication system and that is an advantage and at the same time a problem for Apple.
The advantage is obvious. Makes that many users will think much the change your iPhone by some smartphone Android and not to follow communicating is with their contacts. Is true that for Spain or Latin America this problem not is so large, since the share of market iMessage is small (equal that the share of market of devices iOS), but not occurs it same in others territories as USA where the service of Apple is tremendously popular.

The main disadvantage for Apple and also for users of the devices of the company is that they can not communicate through this app with users of other brands of smartphones. This makes it necessary to have other messaging apps installed such as WhatsApp or Facebook Messenger, what prevents from Apple to impose his service above others.
iOS 10 put much emphasis on bringing improvements to iMessage. New features like the ability to send animations to full screen or messages with different letter styles have had great success among the users and this could be a signal that the Cupertino company wants to turn the app into something much stronger on the market.
The fact that Gruber would ensure that there are models of a version for Android app does not mean really nothing. Is possible that in Cupertino have State doing tests of if would be possible take the service to the platform from Google, although perhaps never it arrive to launch publicly.