Usually operating system launches from Microsoft arrive after the summer but it seems Windows 10 may mark a change from this trend. FUD Zilla claims the OS is coming a bit earlier than expected and heard from its anonymous sources that it may arrive as early as July 2015.
As mentioned earlier this year, Windows 10 will be a free upgrade for anyone with Windows 7 or Windows 8.x so it's reasonable to assume it will capture a lot of marketshare quite rapidly as many people, and especially gamers, will want to upgrade.
We got a better date than that as our sources are promising that we will have Windows 10 in July. All customers with legal versions of Windows 7, 8 and 8.1 can upgrade. We have been playing with Windows 10 since the first Technical Preview and we we like it. It is a synergy of best from Windows 8 and important elements like desktop inspired by Windows 7. Many Window 7 users will want to upgrade.