2015 may finally be the year of in-store mobile, and it's been a long time coming. Deloitte recently found that 84 percent of shoppers use digital devices while shopping in-store, and those who do convert at a 40 percent higher rate. From my company's partnerships with Target and other retailers, we've also found that shoppers who use an in-store feature (e.g., store maps or search filtered for in-stock items) are 50 percent more likely to visit and use the app in-store. While mobile conversion rates may be low, there's no doubt that the devices have a huge impact on in-store purchase decisions. Retailers can't ignore mobile in-store any longer. Here are the top mobile and retail tech trends to look for in 2015: