Hi Dilster, thx for the reply, i looked for any similar question that mine but i didn’t found anything, yet.
The only reference i came across, is quite old now (2011)
http://www.zbrushcentral.com/showthread.php?163328-ZBrush-5-license-Answered&highlight=ZBrush+5
It would be nice if now pixologic decide about that question ^^
but the time to ask for a refund is quite limited, i can’t to wait, and still don’t know what i will doing 
Hi MentalFrog, i understand your point of view, but its different here, pixologic clearly announce R7 to be the latest version of the v4 cycle, usually you don’t know before to buy if there will be some updates or not, but i can already consider that all the bugs on the current R7 i had purchased will never being resolved. that’s sounds rude man 
I Still own a commercial license of 3dcoat, i come to Zbrush, i wish to pay a license for a very long time, at this period i get a nice money entry and i wanted to pay for something i always wanted ’ this include the way pixologic has piloted their business and because of the free updates.
And so because of all this,
Zmodeler and 64bit support was the top reason for the one i get a licence
When it comes to start modeling from scratch, Zbrush has a better toolset that 3dcoat has for Scultping, I might continue 3dc for Retopology purpose, i already switch to Substance painter for all the texture stuffs.
So i get Zbrush purely because i wasn’t happy with 3DCoat sculpting toolset.
All current ZBrush license holders are entitled to a free upgrade to ZBrush 4.0 Win/Mac, regardless of when they purchased ZBrush. If you currently have ZBrush 3.5 (PC) or 3.2 (Mac) you will be sent your upgrade instructions beginning now!
Mean that people who pay their license 6/7 years ago still have a support and receives free upgrades.
I must confess that i had forgotten to read the small 3 number that refer to the footer of the page of Zb4r7, and didn’t understand that the x64 version was a developer preview before i read the “what’s news” PDF.
So 6/7 years of support for 3.0 licensees holders, who surely payed only 595 or 695$ instead of 795$ because before Zbrush 4 the price was not the same that the current one, and one my side, than i would never receive one update ?
This is what make me change my mind, but there is no other choice.
MentalFrog, and it s not like i would have the choice between vast choice of sculpting software, there is Zbrush and zbrush and zbrush, nothing else 
Thx you for your reply, guys
Nicolas