No MicroSD slot and no removable battery means no sale for me. And from the posts on this forum, I'm far from alone.
When my S2 died a couple weeks ago I had already read the rumors that the S6 would lack these critical, basic features. So I went ahead and bought an S5. So glad I didn't wait for the anti-consumer S6.
Removable batteries are both about getting through a full day of hardcore usage without ever being tethered to a charging wire, as well as increasing the overal longevity of the phone by being able to replace it 2-3 years in when it no longer holds a decent charge.
Expandable storage isn't just about having more storage in the device. It's about being able to have safe storage independent of the device that can survive the device failing. Every night my phone does an automatic backup of all my apps and data to my MicroSD card. I can't tell you how many times this has saved me over the years, on multiple phones. More than once on my Samsung Captivate (original Galaxy S). More than once on my S2... including this most-recent time 2 weeks ago. I moved my MicroSD card over to my new S5, restored my data and I was right back where I left off.
And don't give me that crap about backing up to the "cloud". The "cloud" is a joke, and those of us in the Real World don't have data, let alone wifi access 24/7. Just because I don't have wireless signal doesn't mean I don't want my data backed up that night.
Every cell phone I've ever owned has had a removable battery, and every smartphone I've ever had has had a MicroSD card... including some non-smartphones from back when they were called TransFlash. There's no way in hell I'm going to start giving up these basic, core features of owning a phone. If Samsung doesn't get its head out of its ass, stop being stupid and stop being anti-consumer then the S5 could easily be the last Samsung phone I ever buy. I'll miss the OLED screen but they won't deserve my money at that point. I'll vote with my money and give it to a company that isn't into the business of screwing the user and forced-obsolescence.