The BOM for 5G is only ~$80 over 4G. Xiaomi's new flagship Mi Mix 4G is €499. 5G is €599 =  much less than others hoped to charge. Oppo/Vivo wanted US$200 more. Xiaomi has now forced the market to something more reasonable. Everyone except Apple has a 5G phone to announce at Barcelona MWC. Likely, no one will show a phone actually working, fearful to be the first exposing how low the real speeds are for now.

Samsung was first to announce a foldable tablet, seven inches for US$2,000. Then Huawei came in at eight inches for US$2,600. Huawei claimed a download speed of 20 gigabytes/minute. I don't believe they were able to demonstrate anything close but I'm in NY, skipping Barcelona. 

Almost all the announcements are very early. Don't expect many shipments until summer.