Most or even all of the features below are going to be implemented at some point in some way. Please note that this list is ordered by priority, not by implementation date.
Finding THE Riven you really want, by querying for every aspect of a riven. Priority: High
Define which platform you want to sell and buy rivens from. Currently only PC is supported. Priority: Medium
Ever wanted to see how a Riven looks when ranked up, without spending the Endo or Credits? This feature will let you experiment with that. Priority: Medium
If a Weapon is new or you don't want to set a strict price, but still want to get the most out of your riven, auctioning it will let you fetch the best price. Priority: Medium
Setting a price is difficult with how Rivens work, but a quick compare and recent overall popularity and price history for that weapon and possibly stat combinations will help to decide on a fair price much more quickly. Priority: Medium
Endo value, spent Kuva, DPS increase and more will be added to every Riven and can be used to quickly gauge a Rivens base value. Priority: Medium
Filtering rivens is nice, but we want to implement features that will help you compare rivens right in the list like "see all stats maxed" and more. Priority: Medium
Currently you can only view the website in English, but you will be able to change that in the future. Priority: Low
Get updates on all the new stuff that is coming up and important information. Priority: Low
Do you want to get in-depth with Riven selling, buying or reselling? Look no further as this feature will give you a lot of information about market trends, popular stats and overviews about the current state of riven trading. Priority: Low
Link your Steam and/or Warframe accounts to enable even more features! Priority: Low
Get alerted as soon as someone puts up Rivens that you are interested in. Priority: Low
Nobody likes ads, not even the ones getting paid for setting them up, but we will (at some point) need advertisements to keep the website running. But we will make sure to only allow non-intrusive ads, if you spot anything annoying, LET US KNOW ASAP. Priority: Low
Everyone loves QoL (as that is kind of the point), so expect tons of Quality of Life changes towards all aspects of the site. Priority: Low
So Much More!
Just as the title suggests, this is really just the tip of the Iceberg and this list will continue to grow, if you have any idea and/or suggestion, make sure to let us know!