I am unable to set a field of type INLINEHTML using SuiteScript 2.0. However, the same field works with SuiteScript 1.0. Here is the code snippet:
/**
 * @NApiVersion 2.x
 * @NScriptType ClientScript
 */
// In SuiteScript 2.0   
define(['N/search'], function(search) {
    return {
        pageInit: function(context) {
            var currentRecord = context.currentRecord;
            // Set Value (This does not set any data)
            currentRecord.setValue({ fieldId: 'inline_html_field', value: '<div>Test Value</div>' });
            // Get value (Returns undefined)
            currentRecord.getValue({ fieldId: 'inline_html_field'});
        }
    }
});
// In SuiteScript 1.0
nlapiGetFieldValue('inline_html_field'); // Returns the data in field