When will PHP 7 be available as a choice in managed VPS packages

I’m ready to buy Dreamhost managed VPS plan, but when I asked their sales team about PHP 7 availability and possibilities in VPS plans, then they replied me that there is no way to switch to PHP version 7 at this time. Everbudy knows that PHP 7 is 2x to 5x faster than PHP 5.6 with more security and there is too many hosting companys offer it with their shared hosting plans then why Dreamhost not offering it as a choice like user can choose their comfortable version for their project.