does anyone know if pages get an update soon with mail merge? ore do i have to buy open office?

Apple has not made worthwhile changes to Pages v5 for nearly 18 months, so it is unlikely that they will have a surge of conscience over missing features.

If you have an iWork '09 DVD, and the Apple 9.3 updater, use that as it has mail merge and 100+ additional features built-in. Otherwise, you can download LibreOffice, or OpenOffice (order by functionality) Office suites for free. I use LibreOffice myself.