Samsung Electronics filed trademarks for the Galaxy H7, Galaxy H3 and Galaxy H1 names in South Korea through Kipris, the FCC equivalent in the United States. At this point there is little to none information regarding these new Galaxy H series products, which we presume will launch later in the year (2015).
All we know for now, is that these are smartphones, probably made of Aluminium like the Galaxy A series, as Samsung officials revealed that more such premium build quality devices are due throughout 2015, and we assume these are low to mid-range phones.
Earlier this month Samsung also filed trademarks for new Galaxy A series phones: Galaxy A9, Galaxy A8 and Galaxy A6.
More details on the Galaxy H series in the following weeks or months, as they leak out online.